#include <iostream>

using namespace std;

inline char up(const char ch)
{
    if(ch >= 97 && ch <= 122)
    {
        return ch - 32;
    }
    return ch;
}

int main()
{
    cout << "请输入一个字母：" << endl;
    char a;
    cin >> a;
    cout << up(a) << endl;
    return 0;
}